Question

A crane uses a 1, 875 N force to lift a car to a height of 17 m. a. How much work is done on the car? b. The crane's hydraulic motor does a 108 kJ work on the cable in the crane. What is the efficiency of the crane?

Answer 1

a) W=2200*25=55000Joule b) Efficiency=55000/110000=0.5 c) Potential energy= 2200*25=55000 J

Answer 2

Answer:

work done = 31875J

efficiency of moror = 29.51%

Explanation:

work = force x displacement

= 1875 x 17 = 31875 J

Cranes motor does work = 108KJ

work efficiency = output /input * 100

= (31875/108000)*100

= 29.51%